Spring @Autowired 어노테이션

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans   
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
	<!-- 
	-RequiredAnnotationBeanPostProcessor  :@Required 사용시
	-AutowiredAnnotationBeanPostProcessor : @Autowired 사용시
	-CommonAnnotationBeanPostProcessor : @Resource,@PostConstruct , @PreDestroy 사용시
	-ConfigurationClassPostProcessor : @Configuration 사용시 
	
	아래 태그로 대체 가능
	<context:annotation-config /> 
	-->
	
	
	
	
	<!-- @Autowired 어노테이션 사용시 필수적으로 설정 -->
	<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />
	
	<bean id="monitor" class="madvirus.spring.chap04.homecontrol.SystemMonitor" />
	
	<bean id="sender" class="madvirus.spring.chap04.homecontrol.SmsSender" />

</beans>

MessageSender.java

package madvirus.spring.chap04.homecontrol;

public interface MessageSender {

}

SmsSender.java

package madvirus.spring.chap04.homecontrol;

public class SmsSender implements MessageSender {
	public SmsSender() {}
	
	public SmsSender(boolean value) {}
}

SystemMonitor.java

package madvirus.spring.chap04.homecontrol;

import org.springframework.beans.factory.annotation.Autowired;

public class SystemMonitor {
	private int periodTime;
	private MessageSender sender;

	public SystemMonitor(int period){
		this(period, null);
	}
	public SystemMonitor(int periodTime, MessageSender sender) {
		super();
		this.periodTime = periodTime;
		this.sender = sender;
	}
	public SystemMonitor(){
		
	}
	public int getPeriodTime() {
		return periodTime;
	}

	public void setPeriodTime(int periodTime) {
		this.periodTime = periodTime;
	}

	public MessageSender getSender() {
		return sender;
	}
	@Autowired
	public void setSender(MessageSender sender) {
		this.sender = sender;
	}	
}

Main02.java

package madvirus.spring.chap04.homecontrol;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main02 {
	public static void main(String[] args) {
		String[] configLocations = new String[] { "applicationContext.xml" };
		ApplicationContext context = new ClassPathXmlApplicationContext(
				configLocations);

		SystemMonitor monitor = context.getBean("monitor",SystemMonitor.class);
		System.out.println(monitor.getSender());
	}
}

객체가 들어오지 않아도 될경우엔
(required=false)명시

기본 값이 true 이며 false로 할경우에는 객체가 들어오지 않아도 에러가 나지 않음



property를 입력하지 않았는데
객체를 받아 들임

이 @Autowired가 이 기능을 수행함
타입 체크를 하여 데이터를 받아들임

 

 

실행화면(Main02.java)
 

madvirus.spring.chap04.homecontrol.SmsSender@1c121b6